src/ZF/EquivClass.thy

-(*  Title: 	ZF/EquivClass.thy
+(*  Title:      ZF/EquivClass.thy
     ID:         $Id$
-    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
+    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     Copyright   1994  University of Cambridge
 
 Equivalence relations in Zermelo-Fraenkel Set Theory 
 *)
 
 EquivClass = Rel + Perm + 
 consts
     "'/"        ::      [i,i]=>i  (infixl 90)  (*set of equiv classes*)
-    congruent	::	[i,i=>i]=>o
+    congruent   ::      [i,i=>i]=>o
     congruent2  ::      [i,[i,i]=>i]=>o
 
 defs
     quotient_def  "A/r == {r``{x} . x:A}"
     congruent_def "congruent(r,b) == ALL y z. <y,z>:r --> b(y)=b(z)"